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Get index of array element faster than O(n)
...['a', 'b', 'c']
hash = Hash[array.map.with_index.to_a] # => {"a"=>0, "b"=>1, "c"=>2}
hash['b'] # => 1
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How to iterate over a JavaScript object?
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906
For most objects, use for .. in :
for (let key in yourobject) {
console.log(key, yourobject[...
Artificially create a connection timeout error
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answered Sep 19 '08 at 10:02
AlexanderAlexander
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pip install from git repo branch
... git+https://github.com/tangentlabs/django-oscar-paypal.git@issue/34/oscar-0.6
And specify the branch name without the leading /.
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Padding characters in printf
...ength of the second string if you want ragged-right lines.
pad=$(printf '%0.1s' "-"{1..60})
padlength=40
string2='bbbbbbb'
for string1 in a aa aaaa aaaaaaaa
do
printf '%s' "$string1"
printf '%*.*s' 0 $((padlength - ${#string1} - ${#string2} )) "$pad"
printf '%s\n' "$string2"
str...
How to check Django version
...nsole and type
>>> import django
>>> django.VERSION
(2, 0, 0, 'final', 0)
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sh: 0: getcwd() failed: No such file or directory on cited drive
... with the same name.
– Jackson
Nov 20 '15 at 18:45
exactly true! nice!
– farhad goodarzi
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MongoDB数据导出导入工具：mongoexport,mongoimport - 大数据 & AI - 清泛...
...，集合中数据如下：
> db.students.find()
{ "_id" : ObjectId("5031143350f2481577ea81e5"), "classid" : 1, "age" : 20, "name" : "kobe" }
{ "_id" : ObjectId("5031144a50f2481577ea81e6"), "classid" : 1, "age" : 23, "name" : "nash" }
{ "_id" : ObjectId("5031145a50f2481577ea81e7"), "classid" :...
滑动菜单使用指导 · App Inventor 2 中文网
...就从屏幕左侧（右侧）滑出，铺满高度、宽度为屏幕的 80%。
菜单内容自己搭：顶部放头像和昵称，下面放几个按钮当菜单项。
拖一个垂直布局（改名 垂直布局_菜单，宽度充满，取消勾选「可见」），里面放一个标签（标签...
【解决】Component does not specify permissionConstraints · App Inventor 2 中文网
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https://community.appinventor.mit.edu/t/cannot-build-first-app/102520/21
来源：【解决】Component does not specify permissionConstraints
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